I have to be honest: I bought the U260 partly because of its appearance: it is a beautiful thing, and Lenovo is one of the few not to slavishly copy the Apple MacBook Air. I bought it to run Ubuntu 11.10 on - that went fine apart from the webcam's microphone, which apparently had some driver issues. Refreshingly, Lenovo is very economical with pre-installed crapware; in fact, once I de-installed Norton I was set to go, to make it my dual-boot Win7/Ubuntu system.
To begin with the positives: the screen is great, as is the keyboard: one of the best I've handled. The machine feels very sturdy overall, and the coating of the shell gives it a very 'softish' feel, which is pleasant to the touch. The system is fast enough overall, thanks to the i7 processor.
An often-raised criticism against this machine has been its allegedly woeful battery life. While it's certainly not sensational, I survived a three-hour train journey without any problems. That was about it, though - but it'll do for me.
The system did have some other problems, though. First of all, the system originally didn't ship with an i7 processor; this one does, but one gets the impression that the designers didn't copy very well with the processor's demainds. For instance, the case gets *very* hot at times, and the fan is therefore blowing a lot of the time. The fan noise is bearable, but nonetheless distracting.
Another major detractor is the touchpad. It's fine for scrolling movements - but the buttons aren't. The require a great deal of care, which woulnd't be such a problem if using the pad itself to click wouldn't involve so much tweaking.
Sadly, these disadvantages brought me to return the unit: the unwilling trackpad and the heat problems made it a bit less than ideal to use as my main machine. The i3 or i5 versions might be safer choices. I'm going to try the U300S instead.